Reenforced grinding wheel



May 11, 1937. WOLF 2,080,156

REENFCRCED GRINDING WHEEL Filed Aug. 15, 1936 Carl MU.

Patented May 11, 1937 UNITED STATES 2,080,156 REENFORCED GRINDING WHEEL Carl Wolf, Meriden,

New Process Abrasive Conn., assignor to Wolfs Wheel, Inc., Meriden,

Conn, a corporation of Connecticut Application August 15,

13 Claims.

This invention relates to abrasive wheels, and more particularly to a reenforced annular grinding wheel for use in grinding pocket and table knives.

Grinding wheels of the above nature, and particularly those operated at high speeds of 1000 R. P. M. or more, are subjected to dangerous stresses and strains. This is especially the case when the grinding wheel has been almost used up and has been weakened due to the reduction in thickness thereof. Various expensive arrangements have been proposed for reenforoing the base of such grinding wheels to prevent the danger of fracture and flying apart due to centrifugal forces.

One object of the present invention is to provide an inexpensive form of reenforcing means for a grinding wheel of the above nature, whereby the possibility of fracture will be reduced to a minimum.

Another object is to provide a grinding wheel of the above nature having improved means for securing it to a driven rotary member, such as a face plate.

A further object is toprovide a reenforcing means of the above nature adapted to be embedded in the base of a hollow cylindrical grinding wheel during the process of manufacture thereof.

A still further object is to provide a reenforced safety grinding wheel of the above nature which will be simple in construction, inexpensive to manufacture, easy to manipulate, compact, ornamental in appearance, and Very efficient and durable in use.

With these and other objects in view, there has been illustrated in the accompanying drawing, one form in which the invention may be conveniently embodied in practice.

In the drawing:

Fig. 1 is a perspective view of a grinding embodying the features of this invention.

Fig. 2 is a section taken on the plane indicated by the line 2-2 of Fig. 1.

Fig. 3 is an enlarged fragmentary end view of a portion of the grinding wheel.

Fig. 4 is a detail perspective view of the reenforcing plate and wire as they appear in their assembled interlocking relationship.

Fig. 5 is an enlarged fragmentary section taken on the line 5--5 of Fig. 3.

Fig. 6 is a side view of a portion of a machine for operating the grinding wheel, and showing the belt and pulley driving means.

wheel 1936, Serial No. 96,187

Referring now to the drawing in which like reference numerals denote corresponding parts throughout the several views, the numeral l0 indicates a hollow cylindrical grinding wheel having a reenforced flat base portion adapted to be rigidly clamped as by hexagonal-headed screws to a pulley driven face plate I2. The face plate I2 is secured upon a stepped spindle M, which is adapted to be rotated by means of a belt |5 which runs on a pulley l6 also secured to said spindle |4,-the spindle l4 being journaled in an upstanding standard ll.

The particular grinding wheel i0 herein illustrated is adapted to grind the side faces of a table knife I8, or the like, and is preferably provided with a beveled front end face l9.

In order to reenforce the material of the grinding wheel to prevent it from being fractured and flying apart when it has worn down, as for instance, to a thickness extending from the base [I to the dash line shown in Fig. 2, provision is made of an endless circular wire ring 20 embedded in the outer corner of said wheel. A plurality of segment-shaped plates 2| are also embedded in the material of the grinding wheel with their outer surfaces flush with the end of the base ll of the wheel l0. While the plates 2| have been herein shown in a plurality of sections, it is within the spirit and scope of the present invention a continuous ring if desired. The wire 20 is preferably disposed within the V formed by the inner surface 22 of the body of said plates 2|, and an inclined diagonal flange 23 extending inwardly from the outer corner or edge of each plate 2|. The plates 2| also have similar inclined flanges 24 depending from the inner edges thereof. The flanges 23 and 24 converge from their outer faces inwardly, and are also embedded in the material of the grinding wheel In.

In order to securely attach the wheel i0 to the rotary face plate I2 of the machine, provision is made of a plurality of tapped bushings 25 embedded in the abrasive material of the wheel l0 beneath the plates 2|, each of said plates 2% within which are fitted 26 of said bushings 25 flush with the external The wheel I0 is also having apertures 25a reduced end portions which preferably are surface of said plates 2|. preferably provided threaded bushings 21 embedded in the material of the wheel in the spaces between the plates 2|,--the bushings 25 and 21 alternating about the base H of the wheel I0. The unthreaded bushings 21 are adapted to receive locating pins to form said plates as with a plurality of un- 28 extending outwardly from the end face 29 of the face plate I 2.

Operation In the operation of the improved safety grinding wheel, the wire ring 20, the flanged plates 2!, and the bushings 25 will coact to reenforce the wheel and prevent fracture thereof, even though the wheel may be worn down until the grinding surface is almost all used up. The

reenforcing plates 2! considerably strengthen the base end of the wheel H thereby causing it to resist any bending stresses while it is being clamped to the face plate [2 by the screws [3. Moreover, the converging flanges 23 and 24 embedded in the wheel prevent all possibility of the bushings 25 from being pulled out of the Wheel when the screws I 3 are being threaded thereinto.

While there has been disclosed in this speciflcation one form in which the invention may be embodied, it is to be understood that this form is shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosure but may be modified and embodied in various other forms without departing from its spirit. In short, the invention includes all the modifications and embodimentsv coming within the scope of the following claims.

Having thus fully described the invention, what is claimed as new, and for which it is desired to secure Letters Patent, is:

1. In a tubular grinding wheel of solid molded abrasive material having a flat base, a wire embedded in said material adjacent the outer edge thereof, and a. reenforcing plate having a converging inclined side section embracing said wire and having its outer surface flush with the base of said wheel.

2. In a hollow cylindrical grinding wheel having a flat base, a reenforcing wire embedded in the material of said wheel adjacent said base, and a plate flush with the surface of said base and having an inclined flange embedded in said material and embracing said wire.

3. In a cylindrical grinding wheel of solid molded abrasive material, an endless reenforcing wire embedded in said wheel, and a plurality of flanged base plates lying flush with the base of said wheel and having their flanges inclined to embrace said wire.

4. In a cylindrical grinding wheel, a reenforcing wire embedded in the base of said wheel, and a plate member having an inclined flange embedded in said wheel and extending from the outer corner periphery thereof to embrace said wire and lock said plate member on said wheel.

5. In a cylindrical grinding wheel having a flat base, a plate disposed upon said base flush with the surface thereof, a tapped bushing embedded in the material of said wheel, said bushing passing through said plate and having its outer end flush therewith, said bushing serving to receive a screw member for attaching said wheel to a rotary face plate.

6. In a cylindrical grinding wheel having a flat base, an apertured plate flush with the surface of said base and having integral means embedded in the interior of said wheel for reenforcing the material thereof, a tapped bushing underlying said plate and having a reduced extremity passing through said plate to receive a screw for attaching said wheel to a rotary face plate.

7. In a cylindrical grinding Wheel of molded abrasive material having a flat base, an apertured plate secured to said base and having means embedded in the interior of said wheel for reenforcing the material thereof, a tapped bushing embedded in said material and passing through said plate to receive a screw for attaching said wheel to a rotary face plate, and an endless circular wire embedded in said material and interlocked with said reinforcing means to still further strengthen the construction of said wheel.

8. In an annular grinding wheel of molded abrasive material having a fiat base, an apertured plate secured to said base and having a pair of inclined ribs embedded in the interior of said wheel for reenforcing the material thereof, a tapped bushing embedded in said material and passing through said plate to receive a screw for attaching said wheel to a rotary face plate, and an endless wire embedded in said material and located in the V between the outer flange and the body of said plate to still further strengthen the construction of said wheel.

9. In an annular grinding wheel of solid molded abrasive material having a flat base adapted to be secured to a rotary face plate, an endless reenforcing wire embedded in said wheel, the base of said wheel having a plurality of sockets formed therein, bushings located in all of said sockets, and plate members covering alternate bushings, each plate member having an inclined rib embedded in said material and interlocked with said wire, the bushings not covered by plate members serving to receive locating pins extending from said face plate, and means connected with the other bushings to secure said wheel to said face plate.

10. In an annular grinding wheel of solid molded abrasive material having a flat base adapted to be secured to a rotary face plate, an endless reenforcing wire embedded in said wheel, the base of said wheel having a plurality of sockets formed therein, and plate members covering alternate sockets, each plate member having an inclined rib embedded in said material and interlocked with said wire, the sockets not covered by plate members serving to receive locating pins extending from said face plate, and means connected with the other sockets to secure said wheel to said face plate.

11. In a tubular grinding wheel of solid molded abrasive material having a flat base, an endless reenforcing member embedded in the base of said wheel, a plate member located outside the base of saidwheel andhaving means extending into the interior of said material and embracing said reenforcing member, and an apertured bushing located within said material and covered by said plate, the aperture in said bushing serving to receive means for attaching said wheel to a rotary driving member.

12. In a tubular grinding wheel of solid molded abrasive material having a fiat base, a wire embedded in said material parallel to the edge thereof, and a reenforcing plate having means embracing said wire, the outer surface of said plate being flush with the flat base of said wheel.

13. In a tubular grinding wheel of solid molded abrasive material having a flat base, a wire embedded in said material adjacent one edge of said base, and a reenforcing plate secured to said base and having an inclined side section embedded in said material and embracing said wire.

CARL WOLF. 

